Angles 1 and 3 are directly across from each other.

They are called vertical angles. They share only a

vertex. They always measure the same. Therefore,

if angle 1 measures 27 degrees, angle 3 will

measure

degrees.

The measure of angle 3 is 27 degrees.

Step-by-step explanation:

The angles 1 and 3 are vertical angles and share same vertex. Therefore, the measure of the angle 1 and angle 3 are equal.

Given,

angle 1 = 27°

Since angle 3 is same as angle 1, the measure of angle 3 is also 27 degrees

angle 3 = 27°.